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Thermal stability of Solar Salt at 650 °C - A deep dive into molten nitrate salt chemistry

Bonk, Alexander and Braun, Markus and Hanke, Andrea and Sötz, Veronika and Bauer, Thomas (2020) Thermal stability of Solar Salt at 650 °C - A deep dive into molten nitrate salt chemistry. SolarPACES 2020, 29.9.-02.10.2020, Albequerque, USA.

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Abstract

At the last SolarPaces conference we demonstrated that the thermal stability of conventional Solar Salt (60-40wt % NaNO3-KNO3) is substantially increased when the storage system including the gas system is sealed.[4] The operating temperature could therefore successfully be enhanced to 600 °C. During the last months we have investigated the temperature regime above 600 °C to push the thermal stability limit even further, e.g. up to 650 °C. In closed systems all gas species relevant for regeneration of the salt (mainly O2 and NOx), will accumulate in the gas phase and shift chemical equilibria to the nitrate and nitrite side of Eq (1) and (2) (shown later), respectively. Yet, it remains unclear which ions participate in the decomposition process into oxide ions. In this study we explored the role of the nitrate and nitrite ions in the decomposition reactions at temperatures up to 650 °C to confirm their role in the overall decomposition process and the importance of gas composition.

Item URL in elib:https://elib.dlr.de/138190/
Document Type:Conference or Workshop Item (Speech)
Title:Thermal stability of Solar Salt at 650 °C - A deep dive into molten nitrate salt chemistry
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bonk, AlexanderAlexander.Bonk (at) dlr.dehttps://orcid.org/0000-0002-0676-7267
Braun, MarkusMar.Braun (at) dlr.deUNSPECIFIED
Hanke, AndreaAndrea.Hanke (at) dlr.deUNSPECIFIED
Sötz, VeronikaVeronika.Soetz (at) dlr.dehttps://orcid.org/0000-0002-8309-6612
Bauer, Thomasthomas.bauer (at) dlr.dehttps://orcid.org/0000-0003-4080-7944
Date:2020
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Concentrating Solar Power, Thermal Energy Storage, Molten Salt, Thermal Stability,
Event Title:SolarPACES 2020
Event Location:Albequerque, USA
Event Type:international Conference
Event Dates:29.9.-02.10.2020
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Bonk, Alexander
Deposited On:04 Dec 2020 13:24
Last Modified:04 Dec 2020 13:24

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